Preheat the oven to 300°F.
Layer 2 long sheets of aluminum foil on a baking sheet, as shown in the video above.
Place the ham cut side down.
Wrap the ham by bring all 4 ends of the foil up and around the ham.
Roast for 2 hours.
Meanwhile, in a medium bowl, whisk together raspberry jelly and mustard until smooth. Reserve about 1 cup of glaze for serving.
Remove the ham from oven and carefully open the wrap. You'll get a pool of juices in the bottom. You can baste it over the ham, if desired.
Increase the oven to 375°F.
Brush on the remaining glaze all over the ham. Roast without cover for 30 minutes, basting every 10 minutes.
Serve with the reserved raspberry mustard glaze on the side.